Sex reassignment, changing the sex assignment of an infant or child by parents and doctors, usually because of fuller understanding of an intersex condition.
Sex reassignment, changing the social sex of an older child or adult who asserts a gender identity opposite to his/her biological and originally assigned sex.
Sex reassignment therapy, an umbrella term used to describe all medical procedures regarding gender reassignment of both transgender and intersexual people
Sex reassignment surgery, a term for the surgical procedures by which a person's physical appearance and function of their existing sexual characteristics are changed to that of the other sex